package com.example;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.eclipse.paho.client.mqttv3.MqttTopic;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;

public class ApolloServer {

    private static String host = "tcp://192.168.0.103:61613";

    private static String userName = "admin";

    private static String passWord = "password";

    private static MqttClient client;

    private static MqttTopic topic;

    private static MqttMessage message;

    private static String myTopic = "topic";

    private static String clientId = "test02";

    public static void main(String[] args) throws MqttException {
        // host为主机名，test为clientid即连接MQTT的客户端ID，一般以客户端唯一标识符表示，
        // MemoryPersistence设置clientid的保存形式，默认为以内存保存
        client = new MqttClient(host, clientId, new MemoryPersistence());
        MqttConnectOptions options = new MqttConnectOptions();
        // 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录，
        // 这里设置为true表示每次连接到服务器都以新的身份连接
        options.setCleanSession(true);
        // 设置连接的用户名
        options.setUserName(userName);
        // 设置连接的密码
        options.setPassword(passWord.toCharArray());
        // 设置超时时间 单位为秒
        options.setConnectionTimeout(10);
        // 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送个消息判断客户端是否在线，但这个方法并没有重连的机制
        options.setKeepAliveInterval(20);
        client.setCallback(new MqttCallback() {
            public void messageArrived(MqttTopic topicName, MqttMessage message) throws Exception {
                //subscribe后得到的消息会执行到这里面
                System.out.println("messageArrived----------");
                System.out.println(topicName + "---" + message.toString());
            }

            public void deliveryComplete(MqttDeliveryToken token) {
                //publish后会执行到这里
                System.out.println("deliveryComplete---------"
                        + token.isComplete());
            }

            public void connectionLost(Throwable cause) {
                // //连接丢失后，一般在这里面进行重连
                System.out.println("connectionLost----------");
            }

            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                System.out.println("topic " + topic + ", message " + message.toString());
            }

            @Override
            public void deliveryComplete(IMqttDeliveryToken token) {

            }
        });
        topic = client.getTopic(myTopic);
        message = new MqttMessage();
        message.setQos(1);
        message.setRetained(true);
        System.out.println(message.isRetained() + "------ratained状态");
        message.setPayload("mqtt.....test....".getBytes());
        client.connect(options);
        client.subscribe(myTopic, 1);
        MqttDeliveryToken token = topic.publish(message);
        token.waitForCompletion();
        System.out.println(token.isComplete() + "========");
    }
}